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Finding the Fourth Proportional to 172.79, 238.49 and 113.82

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Solution

The fourth proportional to 172.79, 238.49 and 113.82 is: 157.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.79 : 238.49 = 113.82 : x
  2. Step 2: Convert to fraction form
    172.79/238.49 = 113.82/x
  3. Step 3: Cross multiply
    172.79x = 238.49 × 113.82
  4. Step 4: Simplify right side
    172.79x = 27,144.36
  5. Step 5: Solve for x
    x = 27,144.36/172.79
  6. Step 6: Final answer
    x = 157.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.